Data from: Persistent genetic signatures of historic climatic events in an Antarctic octopus
Repeated cycles of glaciation have had major impacts on the distribution of genetic diversity of the Antarctic marine fauna. During glacial periods, ice cover limited the amount of benthic habitat on the continental shelf. Conversely, more habitat and possibly altered seaways, were available during...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2012
|
Subjects: | |
Online Access: | http://hdl.handle.net/10255/dryad.37775 https://doi.org/10.5061/dryad.4350cp14.1 |
id |
ftdryad:oai:v1.datadryad.org:10255/dryad.37775 |
---|---|
record_format |
openpolar |
spelling |
ftdryad:oai:v1.datadryad.org:10255/dryad.37775 2023-05-15T13:30:49+02:00 Data from: Persistent genetic signatures of historic climatic events in an Antarctic octopus Strugnell, Jan M. Watts, Phill C. Smith, Peter J. Allcock, A. Louise Antarctica Southern Ocean 2012-02-09T16:18:58Z http://hdl.handle.net/10255/dryad.37775 https://doi.org/10.5061/dryad.4350cp14.1 unknown doi:10.5061/dryad.4350cp14.1/1.1 doi:10.1111/j.1365-294X.2012.05572.x PMID:22494503 doi:10.5061/dryad.4350cp14.1 Strugnell JM, Watts PC, Smith PJ, Allcock AL (2012) Persistent genetic signatures of historic climatic events in an Antarctic octopus. Molecular Ecology 21(11): 2775-2787. http://hdl.handle.net/10255/dryad.37775 DNA Barcoding Ecological Genetics Molluscs Phylogeography Population Ecology Article 2012 ftdryad https://doi.org/10.5061/dryad.4350cp14.1 https://doi.org/10.5061/dryad.4350cp14.1/1.1 https://doi.org/10.1111/j.1365-294X.2012.05572.x 2020-01-01T14:55:37Z Repeated cycles of glaciation have had major impacts on the distribution of genetic diversity of the Antarctic marine fauna. During glacial periods, ice cover limited the amount of benthic habitat on the continental shelf. Conversely, more habitat and possibly altered seaways, were available during interglacials when the ice receded and the sea level was higher. We used microsatellites and partial sequences of the mitochondrial cytochrome oxidase c subunit 1 (MT-CO1) gene to examine genetic structure in the direct-developing, endemic Southern Ocean octopod Pareledone turqueti Joubin, 1905 sampled from a broad range of areas that circumvent the Antarctic continent. We find that, unusually for a species with poor dispersal potential, P. turqueti has a circumpolar distribution and is also found off the islands of South Georgia and Shag Rocks. The overriding pattern of spatial genetic structure can be explained by hydrographic (with ocean currents both facilitating and hindering gene flow) and bathymetric features. The Antarctic Peninsula region displays a complex population structure, consistent with its varied topographic and oceanographic influences. Genetic similarities between the Ross and Weddell Seas, however, are interpreted as a persistent historic genetic signature of connectivity during the hypothesized Pleistocene Western Antarctic Ice Sheet collapses. A calibrated molecular clock indicates two major lineages within P. turqueti, a continental lineage and a subAntarctic lineage, that diverged in the mid-Pliocene with no subsequent gene flow. Both lineages survived subsequent major glacial cycles. Our data are indicative of potential refugia around the Antarctic continent within the Ross Sea, Weddell Sea and off Adélie Land, with mean age of mtDNA diversity within these main continental lineages coinciding with Pleistocene glacial cycles. Article in Journal/Newspaper Antarc* Antarctic Antarctic Octopus Antarctic Peninsula Antarctica Ice Sheet Ross Sea Southern Ocean Weddell Sea Dryad Digital Repository (Duke University) Antarctic Antarctic Peninsula Joubin ENVELOPE(-64.433,-64.433,-64.783,-64.783) Ross Sea Shag Rocks ENVELOPE(-42.033,-42.033,-53.550,-53.550) Southern Ocean The Antarctic Weddell Weddell Sea |
institution |
Open Polar |
collection |
Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
DNA Barcoding Ecological Genetics Molluscs Phylogeography Population Ecology |
spellingShingle |
DNA Barcoding Ecological Genetics Molluscs Phylogeography Population Ecology Strugnell, Jan M. Watts, Phill C. Smith, Peter J. Allcock, A. Louise Data from: Persistent genetic signatures of historic climatic events in an Antarctic octopus |
topic_facet |
DNA Barcoding Ecological Genetics Molluscs Phylogeography Population Ecology |
description |
Repeated cycles of glaciation have had major impacts on the distribution of genetic diversity of the Antarctic marine fauna. During glacial periods, ice cover limited the amount of benthic habitat on the continental shelf. Conversely, more habitat and possibly altered seaways, were available during interglacials when the ice receded and the sea level was higher. We used microsatellites and partial sequences of the mitochondrial cytochrome oxidase c subunit 1 (MT-CO1) gene to examine genetic structure in the direct-developing, endemic Southern Ocean octopod Pareledone turqueti Joubin, 1905 sampled from a broad range of areas that circumvent the Antarctic continent. We find that, unusually for a species with poor dispersal potential, P. turqueti has a circumpolar distribution and is also found off the islands of South Georgia and Shag Rocks. The overriding pattern of spatial genetic structure can be explained by hydrographic (with ocean currents both facilitating and hindering gene flow) and bathymetric features. The Antarctic Peninsula region displays a complex population structure, consistent with its varied topographic and oceanographic influences. Genetic similarities between the Ross and Weddell Seas, however, are interpreted as a persistent historic genetic signature of connectivity during the hypothesized Pleistocene Western Antarctic Ice Sheet collapses. A calibrated molecular clock indicates two major lineages within P. turqueti, a continental lineage and a subAntarctic lineage, that diverged in the mid-Pliocene with no subsequent gene flow. Both lineages survived subsequent major glacial cycles. Our data are indicative of potential refugia around the Antarctic continent within the Ross Sea, Weddell Sea and off Adélie Land, with mean age of mtDNA diversity within these main continental lineages coinciding with Pleistocene glacial cycles. |
format |
Article in Journal/Newspaper |
author |
Strugnell, Jan M. Watts, Phill C. Smith, Peter J. Allcock, A. Louise |
author_facet |
Strugnell, Jan M. Watts, Phill C. Smith, Peter J. Allcock, A. Louise |
author_sort |
Strugnell, Jan M. |
title |
Data from: Persistent genetic signatures of historic climatic events in an Antarctic octopus |
title_short |
Data from: Persistent genetic signatures of historic climatic events in an Antarctic octopus |
title_full |
Data from: Persistent genetic signatures of historic climatic events in an Antarctic octopus |
title_fullStr |
Data from: Persistent genetic signatures of historic climatic events in an Antarctic octopus |
title_full_unstemmed |
Data from: Persistent genetic signatures of historic climatic events in an Antarctic octopus |
title_sort |
data from: persistent genetic signatures of historic climatic events in an antarctic octopus |
publishDate |
2012 |
url |
http://hdl.handle.net/10255/dryad.37775 https://doi.org/10.5061/dryad.4350cp14.1 |
op_coverage |
Antarctica Southern Ocean |
long_lat |
ENVELOPE(-64.433,-64.433,-64.783,-64.783) ENVELOPE(-42.033,-42.033,-53.550,-53.550) |
geographic |
Antarctic Antarctic Peninsula Joubin Ross Sea Shag Rocks Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula Joubin Ross Sea Shag Rocks Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Octopus Antarctic Peninsula Antarctica Ice Sheet Ross Sea Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Octopus Antarctic Peninsula Antarctica Ice Sheet Ross Sea Southern Ocean Weddell Sea |
op_relation |
doi:10.5061/dryad.4350cp14.1/1.1 doi:10.1111/j.1365-294X.2012.05572.x PMID:22494503 doi:10.5061/dryad.4350cp14.1 Strugnell JM, Watts PC, Smith PJ, Allcock AL (2012) Persistent genetic signatures of historic climatic events in an Antarctic octopus. Molecular Ecology 21(11): 2775-2787. http://hdl.handle.net/10255/dryad.37775 |
op_doi |
https://doi.org/10.5061/dryad.4350cp14.1 https://doi.org/10.5061/dryad.4350cp14.1/1.1 https://doi.org/10.1111/j.1365-294X.2012.05572.x |
_version_ |
1766013041302831104 |